Paper-cutting machine



Dec. 20, 1927.

J. E. MULRONEY PAPER CUTTING MACHINE :s sheets-sheet 1 Filed Aug. 28, 1924 Dec 20, 1927. 1,653,304

J. E. MULRON EY PAPER CUTTING MACHINE Filed Aug. 28, 1924 s Sheets-Sheet 2 Patented Dec. 20, 1927.

. 15533304 PATENT OFFICE.-

J'OHN E. MULRONEY, OF CHICAGO, ILLINOIS MARGARE']: B. MULBONEY, EXIOUTBIZ 01' SAID JOHN E. MUIJRONEY, DECEASED,'ASSIGNOR TO EDWABD I. BRACKET! AND FRED BRACKETT, COPAIR/JENERS, DOING BUSINESS AS MACHINE COMPANY, OF. TOPEKA, KANSAS.

v raranrcu'r'rmc macnma.

Application filed August 28,1824. Serial No. 784,786. v

This invention relates to that class of paper-cutting machines having a table or be an upwardly and downwardly movable clamp mounted above the bed, a knife or;

or materia to be operated upon, and whereby the knife is adapted to'be moved downward with respect to the clamp, and at the desired angle, in cutting engagement with the paper.

The principal object of the invention is to provide a simple, economical and eificient paper cutting or trimming machine.

A further objectof the invention is to,

provide a paper cutting or trimming machine of simple and economical construction,' having means for enabling the upwardly and downwardly movable clamp to be automaticall moved into and releasably secured or loc ed in and released from clamping engagement with the aper or materia .to be operated upon, an adapted to enable the knife or cutter to move at the desired angle with respect to the paper and with respect to the clamp when the latter is in clamping position.

'Other and further objects of the invention will appear from the following description and claims, and from an inspec"- tion of the accompanying drawings which 5 are made a part hereof.

The invention consists in the features, combinations, details of construction, and

arrangement of parts herein described and claimed.

In the accompanying drawings: Figure 1 1s a view 1n front-elevat on of a paper-cutting machine constructed in ac-..

cordance with my invention, with parts broken away for the purposeof illustr' tion; I l

, Fig. 2 is a view in vertical section taken on line 2-2 of Fig. 1 looking in the direction indicated by the arrows, and sh'owing the means for. supporting and operating the knife or cutter and the clamp-for clamp-' 'ing the paper in position to be operated upon by the knife or cutter;

tion to Fig. 3 is an enlar ed detail view in front elevation showingt e upwardly and downwardly movable clam ,and the locking and releasing mechanism for automatically looking the clamp in "clamping engagement with the paper to be operated upon, and for releasing the clamp to permit the removal or adjustment of the paper,

Fig. 4 is an enlarged detail view in v'erlooking in the direction indicated 'by the arrows, and showin the toothed rack and pinion mechanism for releasably securing or locking'andreleasin the clamp which holds the paper clamped in position to be operated upon by the knifeor cutter;

Fig. 5 is a similar enlarged detail view in vertical section taken on. line 5-5 of 'Fig. 3, looking in the direction indicated by the arrows, and showing the means for releasably securing or looking and releasin the clam which clamps the pa er in" s1 cutter Fig. 6 is an enlarged detail view of a flexible locking member or band which encircles the lockin, drum or cylindrical looking member fixe to the shaft which operates and releases the toothed rack. and pinion mechanism by means of which the clamp is releasably secured or locked inclamping' position and released; and

F-i 7 "s an enlarged detail view of a pivoted lockingand releasingarm or cam (B er which is shown in front elevation; on i 3. I

n constructing a paper-cutting machine in accordance with my 1nvention,--I provide a main frame 1 comprising end frames 2, 2, having front legs 3 and back legs 4 adapted. to sup ort a bed or table 5 and other arts of t e machine, including upperend rame members 7 and 8. The upper extremities 6, 6, of theend frame members 7 and upper rear end] frame members 8 are. rigidly connected by' means of a transverse upper frame member or metallic cross beam 9, the opposite ends of which are firmly secured in rigid relation to said upright end frame members 7 and d by means of [bolts 10 or other suitable securing means; The front upright-"frame members operated upon by t s kni e or inem- 'tical section taken on line H of Fig. 3,

. thus form a housing in which the cutter' is slidably supported. Upright gibs 16 are -interposed between the rear upright frame members or housing members 8 and the fadjacent surface ofthe cutter 12, and are adjustably held and secured in operative position by means -,;of adjusting screws 16, which are, by preference, provided with lock nuts on and in threaded engagement with said screws for securely holdin them and thereby the gibs in any desired a justed operative position.

v The knife-bar or cutter 12 is of greater length than the width of the machine frame or the distance from outside to outside 0 the upright end frame members 7 and 8 located on the opposite sides of the machine frame and bed. And horizontal slots 15, 15, are provided in the opposite projecting ends or extremities of the cutter bar for receiving operating pins having anti-friction rollers 21 thereon adapted to engage the horizontal walls of the corresponding slot 15 inthe cutter bar through which said pins 20 extend, thus permitting the movement of the cutter bar transversely with respect to the pins 20 and upward and downward at an oblique angle, or in an inclined path,

with respect to thebed 5, and the paper-engaging clamp as hereinafter more particularly described.

Mounted upon andin sliding engagement with the upright frame-members 7 and, by preference, in sliding engagement with ver tical ways or guiding flanges 19,- and slidabjy connected with the-knife-bar 12 at the opposite ends thereof, by means of the pins 20 andanti-friction rollers 21, are upwardly and downwardly movable sliding guides or yokes 19 on which the pins 20 and antifriction rollers ,21 are supported or mounted in position to operatively engage the slotted portigns 15 of the knife-bar. Each oke 19' comprises in its construction a yoke 'member or bracket member 17 andv a rear yoke member, bracket'member. slide or shoe 18, which are secured in fixed relation to each other, and in sliding engagement with the front and rear faces respectively, of the cutter-bar, at or near the opposite ends thereof. These yokes 19' are thus adapted to move upward and downward with the knife-bar or cutter and in sliding engagement with the guiding ways, gibs or flanges ront thus formed on the .opposite sides of the machine.

Each of the yokes 19 is provided with an operating rod or pitman 22, the upper end of which is connected with the forked bottom end 23 of the corres onding yoke by means of a pivot pin 24. nd the lower end of each pitman 22 is operatively connected with operating means of an suitable form; In other words, the kni e bar is operatively connected with suitable operating mechanism or driving mechanism which may be of any desired well known or suitable form. In this instance, an electric motor 25 1s WlllCh is fixed a spur 'inion 27. A,main drive shaft 28 is journa ed in suitable bearings 29' in the main frame and provided with crank arms 30 at the opposite ends of said drive shaft. And each of said crank arms is operatively connected with the lower extremity of a correspondin reciprocating operating rod or pitman 22 y means of a crank pin 31.

The main drive shaft 28 is operatively connected with the motor shaft 26 by means of a suitable train of gears, and suitable shaft mechanism, which may be of any desired, well known or suitable form. For example, a countershaft 32 is journaled in suitable bearings 33 in the main frame, and in parallel relation to the main drive shaft, said countershaft having aspur gear wheel 34 fixed thereto and in toothed engagement with said pinion 27 on the motor shaft. A spur pinion 35 is fixed to thecountershaft 32, and is in toothed engagement with a spur gear wheel 36 fixed to the main drive shaft 28.

Suitable clutch mechanism is provided; which may be of any ordinary and well known or suitable form, and may comprise clutch members 37 and 38, one of which is fixed to the hub of the gear wheel 36 and the. other of whichis mounted upon the main drive shaft 28 and movable longitudinally of said main drive shaft and into and provided, having a motor shaft 26 on out of clutching engagement with the clutch member 37. The clutch mechanism is adapted to be. connected with suitable operating pedal or lever mechanism, which may be of any desired, ordinary or suitable form adapted to enable the main drive shaft to be operatively connected with and released from the source of ower, as desired. A fly wheel 39 is shown xed to the shaft 32.

From the foregoing it will be readily un derstood that the pitman rods 22 and mechanism for operatively connecting the cutter with a motor or source of power may be of anydesired. ordinary and well known or suitable form, and may include any desired suitable form of tripping or actuating and releasing mechanism.

Annupwardly and downwardly movable The clamping bar or clamp extends across v the. machine and over and in transverse relation to the bed or table 5, already described, and is 'slidably mounted between and with its upright 0 posite ends in slidable enga ement with gi s or guiding flanges 41 on t e upright end frame members 7. The oppo site end faces of the clam 40 are thus slidable in upright ways an guides, and are in abutting slidable engagement with ordirectly between the o posed inner side faces 42 of the front u rig t end frame members 7, already descri ed. (See Fi s. 1,2, 3,4and 5.)

elamp-operating pin, stud or boss 45 is mounted on and in fixed rigid relation to the upper portion of the knife or knife-bar 12, and is provided with an anti-friction roller or bearing member 46 rotatively mounted on the projecting stem or body portion of the pin 45 which projects forward beyond the front face of the knife-bar 12, and into and upwardly extending transversely inclined slot 47 formed in the upper portion of the clamp 0r clamping bar 40, already described, and extending upward and downward at an incline which corresponds with the inclined direction of movement of the knife or cutter 12. An upper inclined flange 48, formed, by preference, in one integral piece with the clamping'bar 40,forms an 1'1 per downwardly facing inclined wall 49 of the slot 47. And an upper inclined margin, edge or flange 50 on the clamping bar 40, forms a lower upwardly'facing inclined wall 51 of the inclined slot 47 said walls 50 and 51 of'the inclined slot thus formed being, by preference, parallel to each other, and spaced apart so as to admit therebetween and engage the anti-friction roller or bearing member 46 which is mounted on the stud or boss 45 on the cutter-bar 12, already described. The movement of said roller within and longitudinally of said elongated inclined slot 47 and beneath and in engagement-with the rigid inclined arm or flange 48 on the clamp 40 is thuspermitted. V The roller 46, and the stud 45 on which it is mounted, are of sufficient length to project forward beyond the' front edge of l the bottom inclined wall 51 of the slot 47,

and in position to enable said roller and its supporting pin to operat-ively engage the upper inclined face of a spring-pressed clamp-operating locking lever or arm 52 which is mounted upon andmovable with respect to the front side of the clamp bar 40. This locking lever or arm 52 has its lower end-pivotally or articulately connected between uprightwith or in hinged engagement with the clamp bar 40. The connection of the lower end of the lever 52 with the clam 40 is made in such a manner as to ena Ie the connection to withstand the stresses and strains to which the clamp and said lever or, spring-pressed arm 52 are subjected in use. This vmay be accomplished in a simple and eflicient manner by pivotally .or rockingly mounting the curved or partly circular bottom extremity of the lever arm 52 in a correspondingly curved recess or socket 90, and by securing the lower end a of said lever arm in the socket by means of a pivot pin 91 anchored in the clamp '40 and extending through'a suitable per oration in-the lowerend of said arm or lever 52, however, normally extends upward at an angle withrespect to the bottom inclined face of the upper wallorfiange- 48 of the slot 47 and somewhat above and at a somewhat steeper incline than the bottom wall 51 of said slot. The upper inclined face 94 of the arm or lever 52 is thusin position (See Figs. 1'

to be engaged by the roller 46 on the stem j 45 when said roller moves upward or downward in the inclined slot 47, with the knife or cutter bar 12.

The arm or lever 52 is thus adapted to be pressed downward by the stud or boss 45 and anti-friction roller 46, asthe knife or cutter bar 12 is moved downward, and is adapted to be released and permitted .to be pressed upward by the compression-spring 73 hereafter more particularly described, when the knife or cutter bar is moved upward carrying with it the stud 45 and roller 46 to the upper extremity of the slot 47, asshown in Figs. 1 and '3.

The arm or lever;52 is provided with a compression spring 73 the lower end of which is supported upon the clamp 40, and the upper end of which engages and tends to press upward the upper extremity of said arm or lever 52.' The inclined arm or bar 12 will thus cause the clamp-operating in or stud 45 and its roller 46 to engage boss 45 and roller 46 will exert a downward pressure on the spring-pressed arm or lever 52 and compression-spring 73 which are thus caused to exert a downward pressure on the clamp bar 40 and hold said bar or clam down in clam in en a ement with the paper to be operated upon, whenever the clamp is in its lowered paper-engaging or clamping position.

It is obvious that the knife bar 12 will be guided'downward and transversely of the table or bed of the machine at an incline'corresponding with the inclination of the slot 47, and upward in an inclined path to initialposition. Y The compression spring 73 is mounted in a recess or socket 95 on the clamp 40. And a cover plate 96 is secured in position to cover the recess or socket 95 b means of headed screws or bolts 97, or 0t ier suitable securing means. side of the upper extremity of the locking lever or arm52 is encircled by the upper end of the spring 73, and serves to hold the lat-ter,in operative engagement with said lever.

The lever or spring-pressed arm52 is operatively connected with suitable means for releasably securing or looking the clamp 40 in clamping engagement with material to be operated upon. And suitable paper guiding means-not' shown--which may be of' any desired, ordinary and well known, or-suitable form, is provided for guiding or positioning the paper asit is placed upon thebed or beneath the clamp and in position to be operated upon by the knife or cutter.

The securing or lockin means which is operatively connected wit and adapted to be actuated by the spring-pressed lever 52,

in the form shown in the drawings, is constructed as follows:

A transverse horizontal shaft 99 is rotatively mounted in suitable bearings 1.00 on the upper extremity of the clamp 40 andis provided with spur pinions 101 'at opposite ends of and fixed to said shaft, each of said spur pinions being in toothed engagement with an upright toothed rack 102 fixed to the end frame members7, or other suitable stationalr support. -These toothed racks. 102 are, y preference, mounted on opposite sides of the machine in position to extend above the level of the upper extremity of the And a boss 98 on the under vertically movable clamp 40, and, by reference, in front of the opposite upng t or end margins of the clamp.

Collars 103 fixed to the shaft 99 serve to hold it against endwise movement. A cylindrical locking member in the form of a drum or wheel 104 is hired to the shaft 99 by means of a set screw 105, or other suitable securing means. And a flexible locking member or band 106 is mounted in position to encircle the drum 104, and is supported independently of the drum, and adapted to be secured in fixed clamping or frictional engagement with the periphery of the drum, to lock the shaft 99 so as to prevent its rotation, and thereby releasably secure or lock the clamp 40 in clamping engagement with the paper or material to be operated upon. And said band of flexible clamping member 106 is adapted to be released, to permit the rotation of the shaft 99, and the upward and downward movement of the clamp 40.

One end 107, of the flexible locking memher or band 106', is mounted on and secured to a suitable supporting member or bracket arm 108 on the clamp 40, by means of screws 109, or other suitable securing means. And

the opposite end of said band is provided with a flange or shouldered .end ortion 110, which is adapted to be engaged y an adjacent arm or end portion 111 of a locking and releasing lever or arm 112 which is pivotally mounted upon the upper extremity of the clamp 40, by means of a pivot pin 113, the opposite ends of which are supported in bracket arms 114, or other suitable su porting means on the clamp 40. (See and 5.) The outer or forwardly projecting end 115 of the lever 112 is operatively connected with the upper extremity of the arm 52, by preference, as follows: One or more eye-bolts116 are provided, havin an eye I or eyes 117 at the lower end thereo through which extends a stud, bolt or screw 118, which is anchored in the u per extremity of the lever 52. A -nut or b outer end of the bolt or screw 118 serves to hold the eye-bolt116 in place upon the bolt or screw 118. And a washer 120 is interposed between the nut and said eye-bolt 116.

A connecting arm or bracket 121 is provided having an upper forked end portion 122 which ispivotally connected with the forwardly projecting end portion 115 of the lever 112 by means of a pivot-pin 123, the opposite ends of which are supportedin the forked arms 124 of said forked member 122.

One 'or moredepending rods or arm portions 125 are fixed to and extend downward from theforked up er arm member or arm 121, and may be ormedv in one integral piece withthe same. And the lower extremities igs. 3

ead 119 on the.

of said depending rods or arm portions I are operatively connected with the eye-bolt 116, and thereby with the headed bolt or or head 126 is fixed to the lower extremities of the depending rods or arms 125 by means of threaded nuts 127 in threaded engagement with the lower threaded ends of said depending rods or arms, or other suitable securing means. And the-eye-boltl16 extends upward through a central perforation in the cross piece or head 126, and is encircled by a compression-spring 128, the lower end of which rests upon the cross piece or head 126, and the upper end of which spring is operatively connected with the upper extremity of the eye-bolt by means of one or more threaded nuts 129' on and inthreaded engagement with the upper threaded end of the eye-bolt, and a perforated cross piece or plate 130 through which the eye-bolt extends and which is slidably mounted on the de pending rods or arm members 125 and in engagement with the upper extremity of the spring 128. The perforated plate 130 thus forms a guide for the eye-bolt, and an abutment for the upper extremity of the spring or obtained to insure a proper engagement thus operatively and operation of the parts connected.

A locking pawl, cam, or lever 131 is piv- 1 otally mounted upon the clamp 40 by means of a supporting pivot pin 132, which extends through a perforation 133 in said pivoted member 131. A depending arm or cam portion 134 of the pivoted member 131 is adapted to be moved into and out of engagement with an anti-friction roller 135, which is rotatively mounted on the stem or bolt 118 on the upper extremity of the spring-pressed arm or lever 52. A second depending lever arm 136 on said pivoted arm'or cam memher 131 projects downward from the axis of the pivoted member 131 into the path of movement of the stud 45 and anti-friction roller 46 on the knife bar, and in position to be operatively engaged and operated by said stud and anti-friction roller. An antifriction roller 137 is rotatively mounted upon the lower extremityof the lever arm 136 upon a horizontal pin or axle 138, and in the knife or knife-bar 12 with the stud 45, and anti-friction roller 46, thereon will cause the roller 46 to first engage the shoulder 139 at or near the upper extremity of the spring-pressed lever 52, thus causing the said lever to be pressed downward against the tension of the spring 73, and causing the clamp 40 on which the springpressed lever 52 is mounted to move downward along with and in advance of the cutting edge of the knife until the clamp 40 engages and is interrupted or stoppedin its downward movement by the paper to be operated upon. As the downward pressure on the knife, or downward movement of the knife continues the degree of pressure upon the lever52 will be increased to such an extent that the upper extremity of the lever 52 will be pressed downwardagainst the tension of the spring 73 with such force as to compress said spring and cause the clamp 40 to be pressed downward in clamping engagement with the paper or material to be operated upon, with such force as to securely clamp and hold the paper firmly in position to be operated upon or cut by the knife which is caused to move downward at an incline corresponding to the inclination of the slot 47 in which the stud 45 and antifriction roller 46 are mounted and adapted to travel.

As soon as the downward pressure and downward movement of the spring-pressed lever 52 against the spring 73, and the pressure of the lever and spring against the clamp 40 are suflicient to thus securely clamp and hold the paper or material to be operated upon in position, "it is desirable that. the

clamp should be locked or releasably but firmly secured in its lowered clamping position, and that the lever 52 should be locked in its lowered clamping position independently of the stud 45 and anti-friction roller 46, so as to ermit the movement of said stud and roller ownward to the lower extremity of their path of movement in the slot 47 with the knife without releasing the clamp during such downward movement of the knife, and then u ward into position to cause the clamp to. e released automatically. The initial downward movement of the stud 45 and anti-friction roller 46 in the inclined slot 47 as they pass the shoulder portion 139 of the lever 52 will cause the roller 46 to engage and operate the lever arm 136 of the pivoted lever or cam member 131 in one direction, thereby causing the lever arm or cam 134 of said lever member 131 to engage the roller 135 on the stud or bolt 118 on lever 52, thus pressing or pulling downward the spring-pressed eye-bolt 116, and the outer arm of the lever 112 which engages and acts to tighten the flexible locking member or band 106 upon the periphery of the cylindrical locking member or drum 104, thus locking the shaft 99 against rotation, and thereby releasably securingnr lnr-king th clamp in lowered or clamping position. It is obvious that the upward movement of the knife or knife bar, carrying with it the stud and roller 46 will cause said stud and roller to operatively engage and operate the lever arm 134 of the pivotedlever member 131 in an opposite or releasing direction, thus releasing and permitting the upward movement of the lever 52 in response to the pressure of the spring 73 to releasing position.

. I claim:

1. In a paper cutting machine, the combination of a feed table, a knife reciprocatingly mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted adjacent and in movable relation to the knife, clamp operating mechanism comprising a spring mounted on said clamping member, a boss on the knife and operatively connected with the spring, and means for releasably securing the sprlng at a tension independently of the boss. 2. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted in movable relation to the knife, a pivoted clamping arm mounted on said clamping member, means for operatively connecting said pivoted clamping arm with the knife, and means for locking said pivoted clamping arm member in clamping position.

3. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, a clamping member mounted in movable relation to the knife and feed table, a pivoted clamping arm mounted on said clamping member, means on the knife and adapted to operatively engage and operate said pivoted clamping arm, and means on said clamping member adapted to operatively engage and lock said pivoted clamping'arm in clamping position. i

4. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted in movable relation to the knife, a pivoted clamping arm mounted on said clamping member, means on the knife adapted to operate said pivoted arm. and means for locking said first-mentioned clamping member in clampin position.

5. In a paper cutting machine. the combination of a feed table, a knife mounted in movable relation to the feed table. an upwardly and downwardly movable clamping member mounted adjacent and in movable relation to the knife, a clamping arm mounted on and movable with respect to .said clamping member, means on the knife adapted to operate said clamping arm, means or looking said clamping arm in clamping position independently of the movement of the knife, and means for locking the firstmentioned clamping-member in clamping position.

6. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted adjacent and in movable relation to the knife, a spring-pressed clamping arm mounted on said clamping member, means on the knife adapted to operatively engage and o erate said clamping arm against the tension of the spring, and means on said first-mentioned clamping member adapted to hold said spring-pressed clamping arm in clamping position.

In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted adjacent and in movable relation to the knife, a spring-pressed clamping arm mounted on said clamping member, means on the knife adapted to operatively engage and operate said clamping arm against the tension of the spring, means on said first-mentioned clamping member adapted to hold said spring-pressed clamping arm in clamping position independently of said arm-operating means on the knife, and means for locking the first-mentioned clamping member in clamping engagement with material to be operated upon.

8. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted adjacent and in movable relation to the knife, a spring-pressed clamping arm mounted on said clamping member, means on the knife adapted to operatively engage and operate said clamping arm against the tension of the spring, locking means on said first-mentioned clamping member adapted to hold said spring-pressed clamping arm in clamping position and means operatively connected with said spring-pressed clamping arm for locking said first-mentioned clamping member in clamping engagement withmaterial to be operated upon.

9. In a paper cutting machine. the combination of a feed table. a. knife mounted in movable relation to the feed table. an upwardly and downwardly movable clamping member mounted in movable relation to the knife, a spring-pressed clamping arm mounted on said clamping member, means on the knife adapted to operatively engage and opcrate said clamping arm against the tension' of the spring, locking means on said firstmentioned clamping member adapted to lock the spring-pressed arm in clamping position against the tension of the spring independently of the arm-operating means on the knife, and locking means operatively connected with said spring-pressed arm, for locking said first-mentioned clamping member in clamping engagement with material to be operated upon by the knife.

10. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an up ardly and downwardly movable clamping member mounted in mo able relation to the knife, a spring-pressed clamping arm mounted. on said clamping member, means on the knife adapted to operatively engage and operate said clamping arm against the tension of the spring, locking means on said first-mentioned clamping member adapted to lock the spring-pressed arm in clamping position against the tension of the spring, and locking means adapted to be operatively connected with and disconnected from said spring-pressed arm, for locking said firstmentioned clamping member in clamping engagement with material to be operated upon by the knife.

11. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted in movable relation to the knife, a spring-pressed clamping arm mounted on Find clamping member, means on the knife adapted to operatively engage and operate said clamping arm against the tension of the spring, and locking means on said first-mentioned clamping member and adapted to be actuated by said arm-operating means on said knife, for locking and re- 7 leasing said spring-pressed arm.

ill

' spring-pressed arm, and means for locking said first-mentioned clamping member in clamping engagement with material to be operated upon.

l3. ln {1 paper cutting machine. the combination of a feed table. a knife mounted in movable relation to the feed table, a movable clamping member mounted adjacent to the knife. :1 spring-pressed clamping member mounted on said first-mentioned clamping 14. In a paper cutting machine, the combination of a feed table, a knife mounted inmovable relation to the feed table, a. movable clamping member mounted in movable relation to the knife, a spring-pressed clamping member mounted on said first-mentioned clamping member, means on the knife adapted to engage and operate said spring-pressed clamping member against the tension of the spring, locking means on said first-mentioned clamping member adapted'to operatively engage and release said spring-pressed member, and locking means adapted to be actuated by said last-mentioned locking means, for locking said first-mentioned clamping member in clamping engagement with material to be operated upon.

15. in a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, a movable clamping member mounted adjacent and in movable relation to the knife, a spring-pressed clamping arm mounted on said first-mentioned clamping member, means on the knife adapted to engage and operate said spring-pressed clamping arm against the tension of the'spring, locking means on said first-mentioned clamping member adapted to operatively engage and release said spring-pressed member, and locking means operatively connected with said last-mentioned locking means on said clamping member and with-said arm-operating means on the knife, for lockin said first-mentioned clamping member in 0 amp ing engagement with material to be operated upon.

16. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation 'to the feed table, an upwardly and downwardly movable clamping member mounted adjacent to and in movable relation to the knife, clamp-operating means attached to and movable upward and downward with the knife and operatively connected with said upwardly and downwardly movable clamping member, a rotative looking member operatively connected with said upwardly and downwardly movable clamping member, stationary locking means in operative engagement with said rotative.

clamping member comprising a friction member adapted to frictionally engage and release said rotative locking member.

mounted on said slotted clamping 17. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member mounted in movable relation to the knife, clamp-operating means attached to and movable upward and downward with the knife and operatively connected with said upwardly and downwardly movable clamping member, locking means comprising toothed rack and gear mechanism operatively connected with said upwardly and downwardly movable clamping member, a rotative friction drum connected with said rack and ear mechanism, a flexible friction member a apted to frictionally engage and release said drum, and means on said first mentioned upwardly and downwardly movable clamping member for operating said flexible friction member to cause the same to engage and release said drum.

18. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an upwardly and downwardly movable clamping member adjacent to and movable with respect to the knife, an inclined slot in said clamping member, a boss or stud fixed to and movable with said knife and extending into said slot, a spring-pressed arm movably member and operatively connected with said boss or clampin stud and adapted to be pressed downward by the latter against the tension of said spring, to hold the slotted clamping member in engagement with material to be operate upon,'and means onsaid slotted clamping member for locking said springpressed arm in clamping position.

- 19. In a paper cutting machine, the combination of a feed table, a knife mounted in movable relation to the feed table, an up wardly and downwardly movable clamping member mounted adjacent to theknife and,

having an inclined slot in said clamping member, a boss or stud fixed to and movable with said knife and extending into said slot, a spring-pressed arm movably mounted on said slotted clamping member and operatively connected with said boss or stud and adapted to be pressed by the latter a ainst the tension of said spring, to hold the s otted clamping member in clamping engagement said spring-pressed arm in clamping position, means for releasing said locking means from locking engagement with the springpressed arm, and means for locking the with material to be operated upon, means'on said slotted clamping member for locking slotted clamping member in clamping posiv tion independently of said spring-pressed arm.

Signed at Chicago, in the county of Cook and State of Illinois, this 15th day of August, 1924. a

JOHN E. MULRONEY; 

